<p>In the diagram, triangle $ABC$ is a right-angled triangle where&nbsp;$\angle BAC=90{}^\circ $.</p>
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<ol class="i-list"><li><div class="list-item-paragraph">Find the length of $BC$.</div></li><li><div class="list-item-paragraph">Hence, find the area of triangle $BCD$.</div></li></ol>

In the diagram, triangle $ABC$ is a right-angled triangle where $\angle BAC=90{}^\circ $.

Principles of Plane Trigonometry: Area, Sides, and Angles

Principles of Plane Trigonometry: Area, Sides, and Angles

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